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/* $OpenBSD: getsubopt.c,v 1.4 2005/08/08 08:05:36 espie Exp $ */ |
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/*- |
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* Copyright (c) 1990, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <unistd.h> |
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#include <stdlib.h> |
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#include <string.h> |
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/* |
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* The SVID interface to getsubopt provides no way of figuring out which |
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* part of the suboptions list wasn't matched. This makes error messages |
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* tricky... The extern variable suboptarg is a pointer to the token |
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* which didn't match. |
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*/ |
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char *suboptarg; |
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int |
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getsubopt(char **optionp, char * const *tokens, char **valuep) |
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{ |
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int cnt; |
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char *p; |
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suboptarg = *valuep = NULL; |
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if (!optionp || !*optionp) |
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return(-1); |
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/* skip leading white-space, commas */ |
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for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); |
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if (!*p) { |
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*optionp = p; |
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return(-1); |
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} |
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/* save the start of the token, and skip the rest of the token. */ |
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for (suboptarg = p; |
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*++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); |
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if (*p) { |
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/* |
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* If there's an equals sign, set the value pointer, and |
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* skip over the value part of the token. Terminate the |
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* token. |
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*/ |
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if (*p == '=') { |
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*p = '\0'; |
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for (*valuep = ++p; |
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*p && *p != ',' && *p != ' ' && *p != '\t'; ++p); |
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if (*p) |
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*p++ = '\0'; |
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} else |
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*p++ = '\0'; |
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/* Skip any whitespace or commas after this token. */ |
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for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); |
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} |
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/* set optionp for next round. */ |
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*optionp = p; |
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for (cnt = 0; *tokens; ++tokens, ++cnt) |
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if (!strcmp(suboptarg, *tokens)) |
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return(cnt); |
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return(-1); |
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} |